I am a ebay buyer and most of the time while buying something from ebay the main thing that concerns me is presence of replica items for sale with same picture and description as the original one.
Most of the time the seller wirtes 'this is a replica' on somewhere in the description, which one can miss and it is also irritating when you are really interested in buying the original and ready to pay more for it.
I suggest that there should be a separate field for making whether the product for sale is a replica (like there is to mark whether its used or unused.)